drm/i915/dp: Simplify intel_dp_needs_8b10b_fec()

The intel_crtc_state::fec_enable check in intel_dp_needs_8b10b_fec() is
redundant drop it: originally it ensured that the FEC enabled state for
a CRTC other than the CRTC intel_dp_needs_8b10b_fec() called for is
preserved, even if DSC is not enabled for the latter CRTC. The way FEC
gets enabled for all the CRTCs on an 8b10b MST link is changed by

commit 7c027070e98d ("drm/i915/dp_mst: Track DSC enabled status on the
MST link") and
commit 470b84af457e ("drm/i915/dp_mst: Recompute all MST link CRTCs if
DSC gets enabled on the link")

depending on intel_dsc_enabled_on_link() in intel_dp_needs_8b10b_fec()
instead of the above fec_enable check. Drop the check.

Suggested-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20251020154438.416761-1-imre.deak@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index b0aeb6c2de86ca268f32fc8055e7c3e8df0af72d..475518b4048b7eac562e1bc8f005e5123768a671 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2377,9 +2377,6 @@ bool intel_dp_needs_8b10b_fec(const struct intel_crtc_state *crtc_state,
        if (intel_dp_is_uhbr(crtc_state))
                return false;
 
-       if (crtc_state->fec_enable)
-               return true;
-
        /*
         * Though eDP v1.5 supports FEC with DSC, unlike DP, it is optional.
         * Since, FEC is a bandwidth overhead, continue to not enable it for